186 THE Microscope. 
vated in the air above germ life and this saves it from putrefac- 
tion even when the days are hot. Fruit is sealed in cans not to 
keep out air but germ life. Jn any disease then where there is 
putretaction and fermentation or zymosis there is abundant 
germ life for a cause. 
3rd. There are floral and zoological zones around the earth 
running with the equator or parallels, and each zone has its 
peculiar flora and fauna. If the elephant and other phenome- 
nal animals and plants live in such zones, microscopic animals 
and plants causing disease will do so also. 
4th. Some plants and animals flourish in certain regions— 
in swamps, in valleys dark and cold—and some are marine or 
aquatic and some inhabit sandy plains. When germs of this 
kind cause disease we call the malady endemic. 
5th. Animals can travel with the wind and against it. 
Plants are carried by streams and the wind and by animals, and 
never against the wind. 
6th. Plants grow in the warm days of summer, rest in 
winter and with the spring revive again. Insects also live in 
the summer. 
7th. Animals may be entozoal and live in the dark, true 
parasites, but plants cannot flourish in the dark. Wood and 
Gray both say plants must have light for healthy growth. 
When plants cause disease we must suppose they grow on the 
surface of the body in the light. Animal germs may live any- 
where in the body in the dark and in the light. 
Sth. Animals and plants are not attacked by parasites 
when in perfect health like when they are sickly and weak. 
9th. Certain agents destroy organic life when applied to it. 
We call these agents antiseptics. 
Let us now try some of our common diseases by these 
traits or forms of organic life and see whether we can find any 
similarity. 
Typhus and Typhoid Fevers, have plantings and growings. 
Zymotic, zoological zone for former. Antiseptics influence 
them. 
Small-Pox, Scarlatina, Measles and other eruptions—Plant- 
ing and hatching, travel against the wind, zymotic zones for 
some of them. Antiseptic influence. 
